Linux 上修改 Docker 镜像存储位置
· 阅读需 3 分钟
Senior DevOps / System Engineer @ bytedance
有一台 Linux 开发机，用于构建镜像或者转存镜像，但是系统盘很小，只有 120G，挂载了一块数据盘，500G 的，但是 Docker 默认的镜 像存储位置在系统盘，导致系统盘空间不足，需要修改 Docker 镜像存储位置。
现状
df -h
Filesystem Size Used Avail Use% Mounted on
udev 32G 0 32G 0% /dev
tmpfs 6.3G 27M 6.3G 1% /run
/dev/vda1 119G 87G 27G 77% /
tmpfs 32G 3.5M 32G 1% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 32G 0 32G 0% /sys/fs/cgroup
tmpfs 128M 4.0K 128M 1% /.syskrbonly
/dev/vdb 492G 23G 444G 5% /data00
tmpfs 6.3G 8.0K 6.3G 1% /run/user/0
tmpfs 6.3G 0 6.3G 0% /run/user/2000
tmpfs 6.3G 24K 6.3G 1% /run/user/1000
tmpfs 6.3G 0 6.3G 0% /run/user/1001
可以看到系统盘在 / 下，数据盘在 /data00 下。
➜ ~ docker info | grep "Docker Root Dir"
Docker Root Dir: /var/lib/docker
➜ ~ docker version
Client: Docker Engine - Community
Version: 24.0.7
API version: 1.43
Go version: go1.20.10
Git commit: afdd53b
Built: Thu Oct 26 09:08:20 2023
OS/Arch: linux/amd64
Context: default
Server: Docker Engine - Community
Engine:
Version: 24.0.7
API version: 1.43 (minimum version 1.12)
Go version: go1.20.10
Git commit: 311b9ff
Built: Thu Oct 26 09:08:20 2023
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.6.26
GitCommit: 3dd1e886e55dd695541fdcd67420c2888645a495
runc:
Version: 1.1.10
GitCommit: v1.1.10-0-g18a0cb0
docker-init:
Version: 0.19.0
GitCommit: de40ad0
➜ ~
可以看到，docker 的镜像存储位置在 /var/lib/docker，但是系统盘空间不足，需要修改。
解决
sudo mv /var/lib/docker /data00
添加配置 "data-root": "/data00/docker"
➜ ~ cat /etc/docker/daemon.json
{
"insecure-registries": ["hub.byted.org", "hub.byted.org:443"],
"live-restore": true,
"data-root": "/data00/docker"
}
重启 docker
systemctl restart docker
效果
➜ ~ docker info | grep "Docker Root Dir"
Docker Root Dir: /data00/docker
检查镜像
➜ ~ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
gcr.io/k8s-minikube/kicbase v0.0.43 619d67e74933 2 months ago 1.26GB
moby/buildkit buildx-stable-1 be698b50dea4 7 months ago 172MB
➜ ~
查看磁盘空间
➜ ~ df -h
Filesystem Size Used Avail Use% Mounted on
udev 32G 0 32G 0% /dev
tmpfs 6.3G 27M 6.3G 1% /run
/dev/vda1 119G 17G 97G 15% /
tmpfs 32G 3.6M 32G 1% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 32G 0 32G 0% /sys/fs/cgroup
tmpfs 128M 4.0K 128M 1% /.syskrbonly
/dev/vdb 492G 89G 378G 19% /data00
tmpfs 6.3G 8.0K 6.3G 1% /run/user/0
tmpfs 6.3G 0 6.3G 0% /run/user/2000
tmpfs 6.3G 24K 6.3G 1% /run/user/1000
tmpfs 6.3G 0 6.3G 0% /run/user/1001
系统盘空间充足，数据盘空间充足。